California school shooting: Two dead after gunman opens fire in primary school classroom

A man opened fire in a classroom at a primary school in south California, reportedly killing a female teacher and wounding two children before turning the gun on himself.

The incident, an apparent murder-suicide, happened at about 11am on Monday in a classroom at North Park Elementary School in San Bernardino, east of Los Angeles.

The wounded students, who were taken to hospital for treatment, were not believed to have been targeted by the gunman, police said.

Their conditions were not immediately known.

Police Captain Ron Maas said investigators were working to confirm the identities of the gunman and the dead woman to determine their relationship, if any, and whether the shooting stemmed from a domestic dispute.

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San Bernardino police offers stand guard at North Park Elementary School (Getty Images)

Authorities provided few details about the circumstances of the North Park Elementary shooting, except to say that the gunman had gained entry to the school as a visitor and kept his weapon concealed until inside the classroom.

Two adults are deceased in a classroom, believed to be a murder suicide. We believe the suspect is down and there's no further threat.